Adobe announced details for an update to its iOS and Android versions of Reader, including the introduction of cloud file storage with Acrobat.com

Adobe Reader for iOS

You can share documents between all of your devices and computers over Acrobat.com from directly within Reader. If you’re reading a document on your laptop, but need to leave for the train, just save it to Acrobat.com, and then open it on your phone or tablet. And if you make comments on the document, we’ll automatically save it back to the cloud from your device, as well.

More info: http://blogs.adobe.com/readermobile/2012/10/15/updated-reader-for-ios-and-android/